编辑文件 - gradient-ring.frag

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路径: /home/qyel0117/public_html/wp-content/themes/semplice7/assets/shader/generative/gradient-ring.frag
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precision mediump float;
varying vec2 vUv;
uniform float time;
uniform vec2 resolution;
uniform vec2 mouse;
uniform float speed;
uniform float noiseScale;
uniform float innerRadius;
uniform float glowIntensity;
uniform float glowFalloff;
uniform float sharpness;
uniform vec3 colorA;
uniform vec3 colorB;
uniform vec3 colorC;

// 3d hash for noise
vec3 hash3(vec3 p) {
  p = fract(p * vec3(443.897, 441.423, 437.195));
  p += dot(p, p.yxz + 29.07);
  return -1.0 + 2.0 * fract(vec3(p.x + p.y, p.x + p.z, p.y + p.z) * p.zyx);
}

// simplex noise 3d
float simplex3(vec3 p) {
  const float K1 = 0.333333333;
  const float K2 = 0.166666667;
  vec3 i = floor(p + (p.x + p.y + p.z) * K1);
  vec3 d0 = p - (i - (i.x + i.y + i.z) * K2);
  vec3 e = step(vec3(0.0), d0 - d0.yzx);
  vec3 i1 = e * (1.0 - e.zxy);
  vec3 i2 = 1.0 - e.zxy * (1.0 - e);
  vec3 d1 = d0 - (i1 - K2);
  vec3 d2 = d0 - (i2 - K1);
  vec3 d3 = d0 - 0.5;
  vec4 h = max(0.6 - vec4(dot(d0, d0), dot(d1, d1), dot(d2, d2), dot(d3, d3)), 0.0);
  vec4 n = h * h * h * h * vec4(dot(d0, hash3(i)), dot(d1, hash3(i + i1)), dot(d2, hash3(i + i2)), dot(d3, hash3(i + 1.0)));
  return dot(vec4(31.316), n);
}

void main() {
  vec2 uv = (vUv * 2.0 - 1.0) * vec2(resolution.x / resolution.y, 1.0);
  // mouse influence on ring center
  vec2 m = (mouse - 0.5) * 0.3;
  uv -= m;
  float t = time * speed;
  float ang = atan(uv.y, uv.x);
  float len = length(uv);
  // noise-distorted ring
  float n = simplex3(vec3(uv * noiseScale, t * 0.5)) * 0.5 + 0.5;
  float r0 = mix(innerRadius, 1.0, mix(0.4, 0.6, n));
  float d0 = distance(uv, r0 / len * uv);
  // primary ring glow
  float v0 = glowIntensity / (1.0 + d0 * glowFalloff);
  v0 = pow(v0, 1.0 + sharpness * 2.0);
  v0 *= smoothstep(r0 * 1.05, r0, len);
  // angular color blend
  float cl = cos(ang + t * 2.0) * 0.5 + 0.5;
  // orbiting highlight
  float a = t * -1.0;
  vec2 pos = vec2(cos(a), sin(a)) * r0;
  float d = distance(uv, pos);
  float v1 = 1.5 / (1.0 + d * d * 5.0);
  v1 *= glowIntensity / (1.0 + d0 * 50.0);
  // fade at edges
  float v2 = smoothstep(1.0, mix(innerRadius, 1.0, n * 0.5), len);
  // hole in center
  float v3 = smoothstep(innerRadius, mix(innerRadius, 1.0, 0.5), len);
  // mouse glow boost near ring
  float mDist = length(uv);
  float mRingDist = abs(mDist - r0);
  float mouseBoost = 1.0 + smoothstep(0.3, 0.0, mRingDist) * 0.5;
  // compose color
  vec3 col = mix(colorA, colorB, cl);
  col = mix(colorC, col, v0);
  col = (col + v1) * v2 * v3 * mouseBoost;
  col = clamp(col, 0.0, 1.0);
  // extract alpha for clean edges on black bg
  float maxVal = min(max(max(col.r, col.g), col.b), 1.0);
  float alpha = maxVal > 0.00001 ? maxVal : 0.0;
  vec3 premul = maxVal > 0.00001 ? col / maxVal : vec3(0.0);
  vec3 final = mix(vec3(0.0), premul, alpha);
  gl_FragColor = vec4(final, 1.0);
}

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